[BUG] ATAPI command TEST_UNIT_READY never succeeds!

[Conke Hu]

Hi,
   Do you ever noticed that the ATAPI command TEST_UNIT_READY always
fails to execute !?
   I debugged in the following environments:
       piix + Intel ICH6/ICH7 PATA
       atiixp + ATI SB600 PATA
       libata + ata_piix + Intel ICH6/ICH7 PATA
       libata + sata_sil24 + Silicon Image 3132
       libata + ahci + ATI SB600 SATA
       libata + ahci + Intel AHCI
   but none of them can execute TEST_UNIT_READY command successfully.
   For example, in ahci driver, ahci_interrupt() reads port status as
0x4000_0000, which indicates an taskfile error.


Conke
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